I've tried to use the class I shared.
I noticed that the second code occured an error "Access violation executing
location." at below.
void Core::Run(const char* source_code)
{
v8::Isolate::Scope isolate_scope(isolate_);
{
v8::HandleScope handle_scope(isolate_);
{
// The error is happened here.
v8::Local<v8::Context> context = v8::Context::New(isolate_);
I captured the error.
[image: error-sample.png]
I'm wondered why the error was occured. I also checked isolate_ is not null.
2022年5月4日水曜日 15:46:20 UTC+9 Kazuya Hiruma:
> Hi, V8 folks.
>
> I'm confused why running a script is failed.
>
> I'm creating V8 api class like below.
>
> It's the header.
>
> #pragma once
> namespace v8_api
> {
> class Core
> {
> private:
> v8::Isolate* isolate_;
>
> static void LogCallback(const v8::FunctionCallbackInfo<v8::Value>&
> args)
> {
> if (args.Length() < 1) return;
>
> v8::HandleScope scope(args.GetIsolate());
>
> v8::String::Utf8Value value(args.GetIsolate(), args[0]);
> std::string str(*value);
>
> std::cout << str;
> }
>
> public:
> v8::Isolate* GetIsolte();
>
> void Initialize();
>
> void Run(const char* source_code);
> };
> }
>
> The implemenation.
>
> #include <iostream>
>
> #include "include/v8.h"
> #include "include/libplatform/libplatform.h"
> #include "v8api.h"
>
> namespace v8_api
> {
> v8::Isolate* Core::GetIsolte()
> {
> return isolate_;
> }
>
> void Core::Initialize()
> {
> std::cout << "Initializing v8_api::Core\n";
>
> std::unique_ptr<v8::Platform> platform =
> v8::platform::NewDefaultPlatform();
> v8::V8::InitializePlatform(platform.get());
> v8::V8::Initialize();
>
> v8::Isolate::CreateParams create_params;
> create_params.array_buffer_allocator =
> v8::ArrayBuffer::Allocator::NewDefaultAllocator();
>
> isolate_ = v8::Isolate::New(create_params);
> v8::Isolate::Scope isolate_scope(isolate_);
>
> const char* src = "function test() { return \"from internal
> calling.\\n\"; } test();";
> Run(src);
> }
>
> void Core::Run(const char* source_code)
> {
> v8::Isolate::Scope isolate_scope(isolate_);
> {
> v8::HandleScope handle_scope(isolate_);
> {
> v8::Local<v8::Context> context =
> v8::Context::New(isolate_);
> v8::Context::Scope context_scope(context);
> {
> v8::MaybeLocal<v8::String> m_source =
> v8::String::NewFromUtf8(isolate_, source_code);
> v8::Local<v8::String> source =
> m_source.ToLocalChecked();
> v8::Local<v8::Script> script =
> v8::Script::Compile(context, source).ToLocalChecked();
> v8::Local<v8::Value> result =
> script->Run(isolate_->GetCurrentContext()).ToLocalChecked();
> v8::String::Utf8Value resultStr(isolate_, result);
> std::cout << *resultStr;
> }
> }
> }
> }
> }
>
> Lastly, it's a client code.
>
> #include <iostream>
> #include <thread>
> #include "v8api.h"
>
> int main(int argc, char* argv[])
> {
> std::cout << "Hello World!\n";
>
> std::unique_ptr<v8_api::Core> core(new v8_api::Core());
> core->Initialize();
>
> const char* src = "function test() { return \"from external
> calling.\\n\"; } test();";
> core->Run(src);
>
> std::this_thread::sleep_for(std::chrono::milliseconds(1000));
>
> return 0;
> }
>
> Above codes are working well but if I comment out invoking `Run` method in
> the `Initialize` method then the invoking second `Run` will fail.
>
> The commented out code is like below.
>
> void Core::Initialize()
> {
> std::cout << "Initializing v8_api::Core\n";
>
> std::unique_ptr<v8::Platform> platform =
> v8::platform::NewDefaultPlatform();
> v8::V8::InitializePlatform(platform.get());
> v8::V8::Initialize();
>
> v8::Isolate::CreateParams create_params;
> create_params.array_buffer_allocator =
> v8::ArrayBuffer::Allocator::NewDefaultAllocator();
>
> isolate_ = v8::Isolate::New(create_params);
> v8::Isolate::Scope isolate_scope(isolate_);
>
> // Comment out here.
> // const char* src = "function test() { return \"from internal
> calling.\\n\"; } test();";
> // Run(src);
> }
>
> --------------------
>
> First one will show me like this.
>
> D:\C++Projects\v8client\x64\Release>v8client.exe
> Hello World!
> Initializing v8_api::Core
> from internal calling.
> from external calling.
>
> But second one is like this.
>
> D:\C++Projects\v8client\x64\Release>v8client.exe
> Hello World!
> Initializing v8_api::Core
>
> Nothing anymore.
>
> -------------------
>
> What's my mistake? Why first one can get result?
>
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